IA
IB
IC
a
b
a<b
a
b
a<b
a
b
a<b
IDLDPU
VA
VB
VC
a
b
a<b
a
b
a<b
a
b
a<b
VDLDPU
OR
AND
AND
AND
AND
AND
AND
AND
AllCurrLow
DeadLineDet1Ph
DLD3PH
DLD1PH
intBlock
Dead Line Detection
ANSI0000035-1-en.vsd
ANSI0000035 V1 EN-US
Figure 394: Simplified logic diagram for Dead Line detection part
13.2.7.4 Main logic
GUID-D474A49E-D3A8-438C-B7E4-E527FEC2F335 v6
A simplified diagram for the functionality is found in figure 395. The fuse failure supervision
function (FUFSPVC) can be switched on or off by the setting parameter
Operation
to
Enabled
or
Disabled
.
For increased flexibility and adaptation to system requirements an operation mode selector,
OpModeSel
, has been introduced to make it possible to select different operating modes for the
negative and zero sequence based algorithms. The different operation modes are:
•
Disabled
. The negative and zero sequence function is disabled.
•
V2I2
. Negative sequence is selected.
•
V0I0
. Zero sequence is selected.
•
V0I0 OR V2I2
. Both negative and zero sequence are activated and work in parallel in an OR-
condition.
•
V0I0 AND V2I2
. Both negative and zero sequence are activated and work in series (AND-
condition for operation).
•
OptimZsNs
. Optimum of negative and zero sequence current (the function that has the
highest magnitude of measured negative and zero sequence current will be activated).
The delta function can be activated by setting the parameter
OpDVDI
to
Enabled
. When selected it
operates in parallel with the sequence based algorithms.
As soon as any fuse failure situation is detected, signals FuseFailDetZeroSeq, FuseFailDetNegSeq
or FuseFailDetDVDI, and the specific functionality is released, the function will activate the output
signal BLKV. The output signal BLKZ will be activated as well if the internal dead phase detection,
DeadLineDet1Ph, is not activated at the same time. The output BLKV can be used for blocking
voltage related measuring functions (under voltage protection, energizing check, and so on). The
output BLKZ shall be used to block the impedance protection functions.
1MRK 502 066-UUS B Section 13
Secondary system supervision
739
Technical manual
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